/Engine/Plugins/Experimental/TextToSpeech/Source/TextToSpeech/Public/TextToSpeechEngineSubsystem.h
Sets the current speech rate strings should be vocalized on a text to speech channel. If the provided channel does not exist, nothing will happen.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=TextToSpeech) void SetRateOnChannel ( [FName](API\Runtime\Core\UObject\FName) InChannelId, float InRate )